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Choose the option in which the order is not in accordance to the property indicated.

(a)  Al3+ <Mg2+ <Na+ <F- (Increasing ionic size) 

(b)  B<C<N<O  (Increasing first ionisation enthalpy)

(c)  I<Br<F<Cl  (Incresing negative electron gain enthalpy)

(d)  Li<Na<K<Rb  (Increasing metallic radius) 

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(b)  B < C < N < O  (Increasing first ionisation enthalpy)

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